A probabilistic strip-yield model for
predicting fatigue crack growth
L. Bukowski, P. Artymiak
Department of Machine Design and Exploitation, University
of Mining and Metallurgy, Cracow, Poland
ABSTRACT
The purpose of the paper was to work out an applicable on a design
stage method for fatigue life prediction of simple machine components
working under particular loading condition taking into consideration a
random character of material properties they are made of. The Newman
model was taken as a basic crack growth model. Procedure for
converting experimental data from AS=const tests to results of AK=const
tests is proposed. Then results of the pseudo-experiments performed at
AK=const are elaborated to obtain mean values, standard deviations and
probability distribution functions for model's constants which are
assumed to store information about material properties. Having these
values it is possible to randomly generate pairs of mantioned above
model's constants, perfo